The MicroStation ribbon interface typically follows the Microsoft Office ribbon with some enhancements.
The ribbon tabs are organized per workflows. Each workflow has a set of tabs and tools within them. The default workflows are Drawing, Modeling (3D model only), Visualization (3D model only), and Task Navigation. Each workflow contains tools pertaining to a common work environment, like the Modeling workflow primarily contains 3D modeling tools for solids, surface, and mesh modeling. Similarly, the Visualization workflow contains relevant tools for animation, rendering, and similar work. The Task Navigation workflow is provided to import and display old tasks and workflows created in previous versions of MicroStation.
https://communities.bentley.com/products/microstation/b/microstation_blog/posts/customization-blog-series-customizing-the-ribbon---blog-1-of-4
https://communities.bentley.com/products/microstation/b/microstation_blog/posts/customization-blog-series-customizing-the-ribbon---blog-2-of-4
https://communities.bentley.com/products/microstation/b/microstation_blog/posts/customization-blog-series-customizing-the-ribbon---blog-3-of-4
https://communities.bentley.com/products/microstation/b/microstation_blog/posts/customization-blog-series-customizing-the-ribbon---blog-4-of-4